Swartchild Black Shield Mainspring for Elgin 6/0s #2890 - Steel

Swartchild Black Shield Mainspring #22473 for Elgin 6/0s, Factory No. 2890, Steel, new in envelope. See images for precise specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.